package com.atguigu.registration.user.api;

import com.alibaba.fastjson.JSONObject;
import com.atguigu.registration.common.helper.JwtHelper;
import com.atguigu.registration.common.result.Result;
import com.atguigu.registration.model.user.UserInfo;
import com.atguigu.registration.user.service.UserInfoService;
import com.atguigu.registration.user.utils.ConstantWxPropertiesUtils;
import com.atguigu.registration.user.utils.HttpClientUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author: Jiang Yizhi
 * @Date: 2022/5/5 11:29 AM
 */
@Controller
@RequestMapping("/api/ucenter/wx")
public class WeixinApiController {

    @Autowired
    private UserInfoService userInfoService;

    /** 回调方法，得到扫码人的信息 */
    @GetMapping("callback")
    public String callback(String code, String state) {
        /** 第一步 获取临时票据 */

        /** 拿着code，微信id和密钥，请求微信固定地址，得到两个值; 使用code和appid以及appscrect换取access_token */
        StringBuffer baseAccessTokenUrl = new StringBuffer()
                .append("https://api.weixin.qq.com/sns/oauth2/access_token")
                .append("?appid=%s")
                .append("&secret=%s")
                .append("&code=%s")
                .append("&grant_type=authorization_code");

        String accessTokenUrl = String.format(baseAccessTokenUrl.toString(),
                ConstantWxPropertiesUtils.WX_OPEN_APP_ID,
                ConstantWxPropertiesUtils.WX_OPEN_APP_SECRET,
                code);
        /** 使用httpClient请求这个地址 */
        try {
            String accesstokenInfo = HttpClientUtils.get(accessTokenUrl);
            /** 从返回字符串中获取openid和access_token */
            JSONObject jsonObject = JSONObject.parseObject(accesstokenInfo);
            String access_token = jsonObject.getString("access_token");
            String openid = jsonObject.getString("openid");

            /** 根据openid判断数据库是否存在扫描人的信息 */
            UserInfo userInfo = userInfoService.selectWxInfoOpenId(openid);

            if (userInfo == null) { /** 数据库不存在微信信息 */
                /** 拿着openid和access_token请求微信地址，得到扫码人信息 */
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl, access_token, openid);
                String resultInfo = HttpClientUtils.get(userInfoUrl);
                JSONObject resultUserInfoJson = JSONObject.parseObject(resultInfo);
                /** 解析用户信息 */
                String nickname = resultUserInfoJson.getString("nickname");
                String headimgurl = resultUserInfoJson.getString("headimgurl");
                /** 获取扫码人信息添加到数据库 */
                userInfo = new UserInfo();
                userInfo.setNickName(nickname);
                userInfo.setOpenid(openid);
                userInfo.setStatus(1);
                userInfoService.save(userInfo);
            }

            Map<String, Object> map = new HashMap<>();
            String name = userInfo.getName();
            if (StringUtils.isEmpty(name)) {
                name = userInfo.getNickName();
            }
            if (StringUtils.isEmpty(name)) {
                name = userInfo.getPhone();
            }
            map.put("name", name);
            /** 判断userInfo是否有手机号，如果手机号为空，返回openid
             * 如果手机号不为空，返回openid是空字符串
             * 前端判断：如果openid不为空，绑定手机号，如果openid为空，不需要绑定手机号
             */
            if (StringUtils.isEmpty(userInfo.getPhone())) {
                map.put("openid", userInfo.getOpenid());
            } else {
                map.put("openid", "");
            }
            /** 使用jwt生成token字符串 */
            String token = JwtHelper.createToken(userInfo.getId(), name);
            map.put("token", token);
            /** 跳转到前端页面 */
            return "redirect:" + ConstantWxPropertiesUtils.YYGH_BASE_URL + "/weixin/callback?token="
                    + map.get("token") + "&openid=" + map.get("openid") + "&name="
                    + URLEncoder.encode((String) map.get("name"), "utf-8");

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

    }

    /** 生成微信扫描二维码 */
    @GetMapping("getLoginParam")
    @ResponseBody
    public Result genQrConnect() {
        try {
            Map<String, Object> map = new HashMap<>();
            map.put("appid", ConstantWxPropertiesUtils.WX_OPEN_APP_ID);
            map.put("scope", "snsapi_login");
            String wxOpenRedirectUrl = ConstantWxPropertiesUtils.WX_OPEN_REDIRECT_URL;
            wxOpenRedirectUrl = URLEncoder.encode(wxOpenRedirectUrl, "utf-8");
            map.put("redirect_uri",wxOpenRedirectUrl);
            map.put("state", System.currentTimeMillis()+"");
            return Result.ok(map);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return null;
        }


    }



}
